About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Mechanical Responses of a Ductile-phase-toughened Tungsten Alloy Irradiated with Ion Beams at an Elevated Temperature |
Author(s) |
Tianyi Chen, Ana Garcia Caraveo, Spencer Doran, James V. Haag IV, Weilin Jiang, Lei Li, Zhihan Hu, Lin Shao, Wahyu Setyawan |
On-Site Speaker (Planned) |
Tianyi Chen |
Abstract Scope |
Ductile phase toughened (DFT) W-Ni-Fe alloys have enhanced fracture toughness compared to pure tungsten, which suffers from brittleness as plasma-facing materials. In their as-fabricated state, microcracks initiated at tungsten grain boundaries are arrested by the ductile NiFeW phase. However, after Ni+ and He+ ion irradiation simulating the damage experienced in conceptual fusion power reactors, cavities were observed in both phases and along the W/NiFeW interface, raising concerns about potential impairment of the DFT mechanisms due to the loss of interfacial cohesion and irradiation hardening.
In-situ SEM micro-mechanical characterization of the radiation responses of the metallic phases and the interface was conducted to quantify the microstructure-specific irradiation-induced degradation. By incorporating micromechanical inputs, the macroscopic material property degradation by radiation damage was estimated. The integration of ion irradiation and micromechanical techniques in predicting material performance under fusion-reactor conditions is demonstrated, providing a greater predictive capacity in the estimation of material service lifetimes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Environmental Effects, |